Exercise machine



FIG. 1 is a perspective view of an exercise machine of the present invention.

FIG. 2 is a right side elevational view thereof.

FIG. 3 is a left side elevational view thereof.

FIG. 4 is a top plan view thereof.

FIG. 5 is a bottom plan view thereof.

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a rear elevational view thereof.

The broken lines illustrate portions an exercise machine which forms no part of the claimed design. 

The ornamental design for an exercise machine, as shown and described. 